Improvement in blackboard-rubbers



H. H. B'URRINGTON. BLACK BOARD RUBBER.

No.178,594. Patented June 13, 1876.

N PETERS, PHOTOLITHOGRAPHER, WASHINGTON. D C.

UNITED STATES PATENT OFFICE,

HENRY H. BURRINGTON, on PROVIDENCE, RHODE ISLAND.

IMPROVEMENT lN BLACKBOARD-RUBBERS.

Specification forming part of Letters Patent No. 178,594, dated June 13,1876; application tiled October 9, 1875.

To all whom it may concern:

Be it known that I, HENRY H. BURRING- TON, of the city and county ofProvidence,

State of Rhode Island have invented a new and useful Blackboard-Eraser,which invention is described in the following specification, and shownin the drawings.

Figure l is an elevation of the eraser, the righthand half being shownin section. Fig. 2 is a plan or top view.

In these drawings, B is an oblong rectangular base-block, having itsfour corners rounded off so as not to have any square or right-anglecorners to dent or injure the board or plastering on which theblackboard is made. I cover the under side and edges of this block withplush carpet E, or some brush material, and place between the carpet andblock one or more thicknesses of wadding to form a cushion, and turn theedges of the carpet over on the top of the block, and fasten them withnails. The handle A is made in the form shown, with its ends 0 O beveledoff, and its edges grooved so as to be held readily with the hand, andis fastened to the top of the base-block B by the screws F F, which holdit firmly. The ends 0 O of the handle are rounded, and it is desirableto make the handle a little shorter than the block B.

What I claim as nay-invention and improvement in blackboarderasers is 1.The base or block 13, having the rubbing corners and ends rounded, sothere shall be no square or right-angle corners to dent or injure theboard or plastering on which it is made.

2. In combination with the base or block, provided with rounded rubbingends and corners, the handle having rounded ends, substantially asdescribed.

HENRY H. BURRINGTON.

Witnesses:

DANIEL LEAGH, WALTERL. WATSON.

